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Lexus RX300 Car and Truck Battery

Make and Model FAQs | Buying Guide

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Only available for cars and trucks newer than 1981.

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Only available for cars and trucks newer than 1981.

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Where can you find a new battery for your 2003 or earlier model Lexus RX300? Visit Batteries Plus either online or in store. You'll find only the best batteries from brands like Duracell and X2Power. Plus, we offer free battery testing and expert installation with an auto battery purchase (valid at participating locations on most vehicle makes and models). Do you need a replacement fob for your Lexus RX300? Take advantage of our key fob programming service (valid at participating locations only).

How Do I Know What Battery to Get for My Car?

  • Find the correct group battery size for your Lexus RX300, which can be found in your owner's manual or online.
  • Determine the recommended CCA (Cold Cranking Amps) rating for your vehicle, which is also found in your owner's manual.
  • You can buy a battery with a higher than recommended CCA rating, but do not buy one with a lower number of CCAs than your vehicle requires.
  • Check your owner's manual or the label on your current battery to determine if your battery requires an AGM battery.
  • If your vehicle requires an AGM battery, you must replace it with another AGM option.

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Lexus RX300 FAQs

There are several ways to find the correct battery size for your Lexus

  • Check your owner's manual.
  • Look for the information online.
  • Use the fitment finder on the Batteries Plus auto battery page to find a list of compatible batteries.

An auto battery typically lasts 3-5 years. If your battery is older than that, you should have it tested. If you're having a hard time starting your engine, notice that your headlights appear dimmer, or are experiencing issues with your onboard technology, there's a good chance your battery needs to be replaced.

The type of battery you select will determine cost. Flooded batteries offer the most affordable upfront option. Since AGM batteries last longer, however, they are typically a better longer term investment than a flooded battery.

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